Fluid heater



June 15 1926.

M. H. SHOENBERG- ET AL FLUID HEATER Original Filed April .50. 1924INVENTOR.

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Patented. June 15, 1926.

UNITED STATES PATENT OFFICE.

MILTON H SHOENBERG AND LESTER SCHON, OF SAN FRANCISCO, CALH'OBNIA; SAIDSCHON ASSIGNOR TO SAID SHOENBERG.

FLUID HEATER.

Application filed April 30, 1924,'Seria1 No. 710,003. Renewed Februaw18, 1928.

Our invention has for its object a simple electric device for heatingwater or other fluids in any conventional container.

Other objects are means for automatically interrupting the energizingcircuit when the heating element becomes too hot, and also means formaintaining the heating element deenergized until it has been plungedinto the fluid to be heated, or when withdrawn therefrom. v

Other objects are a heating element inclosing an electrical resistancehermetically sealed therein and mounted on a tubular telescoping supportin combination with automatic cut-out means interrupting the circuitwhen the element becomes overheated.

By referring to the accompanying drawings our invention will be madeclear.

Fig. 1 is a side view of one form of heater employing our invention.

Fig. 2 is an enlarged fragmentary side view with some of the partsbroken away to better show the details of construction.

Fig. 3 is a section of the tubular support and showing in view thesupporting arm of the heating element and is taken on the line TIL-IIIof Fig. 2.

Fig. 4 is a part cross section ,and part side view of the heatingelement with the automatic cut-out means and the electric circuitconnections, and also shows the winding of the resistance wire withinthe heating element.

Fig. 5 is a fragmentary enlarged cross section at right angles to Fig. 4showing the manner of winding and insulating the resistance element andits mounting within the metallic sheath. 7

Throughout the figures similar numerals refer to identical parts.

A base plate is shown by the numeral 1 from which rises the standard 2and within which latter is telescoped the tube 3, the latter carrying anextended arm 4 having a clamp screw and collar at 5, 6, respectively anda releasing pin at 7 normally held in the position shown in Fig. 2 bythe spring 8. When the pin 7 is withdrawnthe passageway within thestandard 2 is cleared and the member 3 then telesco the full lineposition of F gl, at which time 27 burns.

pe's or we may the. heating element 9 has fully entered the tumbler orother receptacle 10, and is now in position for heating the water orother fluid 11. When the member 3.falls within the tube 2 due to thewithdrawing of the pin 7 the connections 12, 13, engage with the circuitterminals 14, 15, respectlvely completing the electrical circuit fromthe energizing connections 16, 17, through the resistance 18.

' The current now flows through the resistance winding 18 highly heatingthe sides 19, 20, of the heating element 9 which is shaped to give alarge metallic surface exposure and therefore to most readily transmitthe heat from the resistance coil 18 to the fluid 11.

Circuit connections to the coil 18 are es-- tablished in anyconventional manner as through the wires 21, 22, to the frictionalcontacts 23, 24, respectively which co-operate with the connections inthe socket 25 energizingwires 26 and thence to the connections 12, 13.

WVe prefer to mount the lamp 27 in the circuit of the heating element sothat when the heating element is being energized the lamp Its manner ofconnection preferably in parallel, is well known and therefore notshown.

It will now be seen that if the heating element is 'in operation, thecircuit plug 25 be removed from the pins 23, 24, the circuit will bebroken. To automatically accomplish this when the heating element 9becomes overheated, we provide the tube within which is adapted toloosely slide the plug 31. This plug is held in the full line positionof Fig. 4 by the wire 32 which is to the energization of the coil- 18,the pin 25 and therefore plug 33 become heated and if or when this heatexceeds the melting point of the solder in the collar '33, the spring36, which is normal y under c mpre sion,

forces the release of the wire 32 causing the plug 31 to fly upwardunder the action of the spring. This action pushes the connecting heador circuit plug free from the terminals 23, 24, breaking the circuit andthus causing the automatic interruption of the circuit as abovedescribed. A new safety element may be now introduced or the old onerepaired and reused by compressing the spring and again soft solderingthe wire 32 in the plug \Ve claim:

1. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through said members.

2. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members-and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through said members and plugs and sockets for said connectionsWithin said members adapted to break the circuit as the members areseparated.

3. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through said members and plugs and sockets for said connectionswithin said members adapted to break the circuit as the members areseparated and latch means to normally keep the members separated.

4. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members and overhanging said base,an electrical resistance heatingelement depending irom said arm, energizing connections for said heatingelement through said members and plugs and sockets for said connectionswithin said members adapted to break the circuit as the members areseparated and latch means to normally keep the members separated, acircuit plug for said heat element and means adapted to release a springand disconnectthe plug and heat element and interrupt the energizingcircuit when the element exceeds a predetermined heat.

5. In a fluid heater a base and a standard thereon'said standardcomprising a pair of telesco ing members, an arm extending from one ofsaid members and overhanging said base, an electrical resistance heatng. elethe solder melts the spring expands ment depending from said arm,energizing connections for said heating element through said members andplugs and sockets for said connections within said members adapted tobreak the circuit as the members are separated and latch means tonormally keep the members separated, a circuit plug for said heatelement and means adapted to disconnect the plug and heat element andinterrupt the energizing circuit when the element exceeds apredetermined heat and comprising a spring restrained by a solderedconnection which when the solder melts due to excessive heat, isreleased and separates the plug and the element. I

6. Safety means for an electric heating device comprising a springcompressed within a tube, a tie wire soldered to one end of said tubeand holding said spring compressed a drive pin at the other end of thetube and circuit breaking means whereby when forcing the drive pin toactuate the circuit breaking means.

7 In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through said members in combination with safety means comprisinga spring compressed within a tube a tie wire soldered to one end of saidtube and holding said spring compressed, circuit breaking means and adrive pin at the other end of the tube which actuates the circuitbreaking means when the solder melts.

8. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one ofsaid members and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through saidmembers and plugs and sockets for said connectionswithin said members adapted to break the circuit as the members areseparated in combination with safety means comprising a springcompressed within a tube a tie wire soldered to one end of said tube andholding said spring compressed, circuit breaking means and a drive pinat the other end of thetube which actuates the cirguit breaking meanswhen the solder me ts.

9.. In a fluid heater a base and a standard thereon said standardcomprising a pair of telescoping members, an arm extending from one of.said members and overhanging said base, an electrical resistance heatingelement depending from said arm, energizing connections for said heatingelement through said, members a d plugs and sockets for said.

connections within said members adapted to pressed, circuit breakingmeans and a drive break the circuit as the members are sepapin at theother end of the tube which acturated and latch means to normally keepthe ates the circuit breaking means when the s01- 10 members separatedin combination with safeder melts.

6 ty means comprising a spring compressed within a tube a tie wiresoldered to one end MILTON -H. SHOEN BERG. of said tube and holding saidspring com- LESTER SGHON.

